Radiator



Aug. 27, '1 929;

T. E. MURRAY RADIATOR Original Filed April 26; 1924 #012145 ZZ B Y Zia/NVENTOR rray I fl AITTOYRNEY Patented Au 27, 1929.

UNITED sTA .THOMAS a MURRAY, or BROOKLYN, NEW YORK.

RADIATOR.

Original application filed April 26, 1924, Serial No. 709,080. Divided and this application 'filed July 21,

1928. Serial No. 294,364.

In a previous application No. 7 09,080, filed April 26th, 1924, I have covered certain 1mprovements in radiators for heating the air of rooms having a heating element and certain plates applied thereto for providing a greatly extended heating surface in contact with the air; the heating element being a tube for steam or hot Water or other fluid (or for cold brine or the like when the 10 radiator is used to cool the air) or being an electric or other style of heating element. The present application is a division thereof covering one ofthe several types illustrated in the parent application. The single figure of the drawing illustrates in perspective view the principal parts of the improved radiator.

Referring to-the drawings, 1 is a vertical tubular casing or conduit for the heating (or cooling) medium, the upper portion of which is surrounded by an extended surface structure, while the lower end 2 is left circular for mounting connections of any desired sort.

tended area is provided around and in close contact with the heating element or casing 1. The, latter is preferably of copper for the best conductivity. The sheet metal also is preferably of copper. It can be made very thin because of its high conductivity and because of its shape which contributes greatly to its lateral stiflt'ness and in fact to the stiffness of the entire structure. It is bent horizontally to form a number of hollow flues which are closed in horizontal section and open only at the top and bottom and are of considerable height so as to induce a strong upward draft of the air as the latter is heated. The extended area structure is of special shape to secure the best results.

The hollow fins or closed flues are separated by portions 3 of suflicient width to secure a' good conducting contact with the heating. elementor casing 1. The portions 3 are shaped to fit the casing closely and are united thereto by heat and pressure as, for example, by soldering, welding, or brazing. Such unions make a continuous metalli union which is the best for heat transf r, but other methods of securing the parts to other may be used. i

he space between the hollow fins is left just suflicient for introducing the necessary A sheet of metal providing a greatly extubes to form the desired union with the central casing, and the finsthemselves are made of a special shape to secure the best flue effect. The sides of the flues are made of two parts-4 and 5, the latter converging to a point or edge 6. A large number of these flues are mounted around the circumference of the tube so as to secure the maximum area, and consequently each flue is narrow in the cross-section. But within these limits the'flues are made of maximum width in portions closely adjacent to the central cas- .tact with the heat transferring area which is fairly close to the central heating element, and the latter commence to converge only at a point comparatively remote from the heating element, so that the sides are convexed outward at an intermediate point.

The fittings for connecting the central cas ing or tube with the inlet and outlet pipes are not illustrated. They may be of any usual or suitable design. The extended area structure may be made of a single sheet or of single sheets welded at their edges to one another or to the central casing.

The inner portion 3 of this structure is preferably symmetrical in cross-section and extends the full length of the sheet so as to secure the maximum contact area with the casing 1 for conduction of heat very rapidly to the portions 4 and 5. The air is heated bycontact with the latter, both within the flues and within the space between adjacent flues. The heat radiating effect of the complete apparatus is small compared-with the convection effected; that is, the heating of or by contact with the extended surfaces and the rapid upward movement of such heated air causes its circulation through the room. The fact that the heating element 1 forms the inner wall of each of the flues adds materially to the heating efiect within such flue. The rapid draft and circulation of the air takes the heat rapidly away from the central heating element and effects a. correspondingly rapid movement of the steam or other heating medium. Thus a high temperature heating medium may be used with efficiency and the entire radiator may be very much smaller than the ordinary cast iron radiators commonly used, for the same duty. To the same end of securing a small radiator for performing a lar e duty it is preferable to use for both heat ng element and the extended area structure metal of high conducting qualities such as copper, in which term I include brass and other cuprous alloys. But the structure is advantageous with other metals.

For high temperature steam or other high temperature heating elements, the casing 1- ment operated at a high temperature, so

that the comparatively small radiator will perform the same duty for which much larger radiators are now generally used.

Other modifications may be made by those skilled in the art without departing from the invention as defined in the following claim. 1

What I claim is: A radiator including in combination a central vertical casing and a heat transferring structure surrounding the same: comprising a sheet corrugated in horizontal section and having portions in close contact With the central casing and making a good heat conducting joint therewith and forming vertical fiues for inducing a rapid upward draft ofthe heated air, said casing being of "comparatively small cross-section and said heat transferring structure extending outward to av distance substantially I greater than the width of the casing, so that the latter may carry a high temperature heat medium and the heat therefrom will be taken away and transferred to the air and carried off by the rapid draft induced in the fiues, the parts being of copper to further facilitate the rapid transfer of heat to the extreme limits of the structure.

In witness whereof, I have hereunto signed my name.

THOMAS MURRAY. 4 

